fixes #221 Add support for VMWare Workstation in Windows

This adds support for VMWare Workstation 9 for Windows. I've only tested it with VMWare Workstation 9.0.2 but it should with with any 9.x version. I also added `XC_OPTS` to `scripts/dist.sh`, as I had to use
<pre>
$ XC_OS=windows XC_ARCH=amd64 XC_OPTS=-tasks-=go-test scripts/dist.sh
</pre>
to be able to cross-compile.